Changes between Version 30 and Version 31 of Commentary/GSoCMultipleInstances


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Timestamp:
Jun 21, 2012 1:22:29 PM (3 years ago)
Author:
simonmar
Comment:

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  • Commentary/GSoCMultipleInstances

    v30 v31  
    1111 * some form of garbage collection should be offered to have a chance to reduce the amount of installed packages
    1212
     13== Hashes and identifiers ==
     14
     15There are three identifiers:
     16
     17 * `XXXX`: the identifier appended to the installation directory so that installed packages do not clash with each other
     18 * `YYYY`: the `InstalledPackageId`, which is an identifier used to uniquely identify a package in the package database.
     19 * `ZZZZ`: the ABI hash derived by GHC after compiling the package
     20
     21The current situation:
     22
     23 * `XXXX`: is empty, which is bad (two instances of a package install in the same place)
     24 * `YYYY`: is currently equal to `ZZZZ`, which is bad because we need to make more distinctions:
     25   * we need to distinguish between two packages that have identical ABIs but different behaviour (e.g. a bug was fixed)
     26   * we need to distinguish between two instances of a package that are compiled against different dependencies, or with different options, or compiled in a different way (profiling, dynamic) 
     27
     28Some requirements and notes:
     29
     30 * `XXXX` must be decided ''before'' we begin compiling, whereas `ZZZZ`
     31
     32
    1333== Install location of installed Cabal packages ==
    1434